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Where possible, let the engine cool down and
touch only the components described in the
following.
G
WARNING
The cooling system is pressurized, particularly
when the motor is warm. If you open the cap,
you could be scalded if hot coolant sprays out.
There is a risk of injury.
Let the engine cool down before you open the
cap. Wear protective gloves and protective
eyewear when opening. Open the cap slowly
to release pressure.
The coolant level may only be checked and cool-
ant refilled when the engine and engine cooling
system have cooled down.
G
WARNING
Windshield washer concentrate is highly flam-
mable. If windshield washer concentrate gets
onto hot components of the engine or the
exhaust system, it can ignite. There is a risk of
fire and injury.
Make sure that windshield washer concen-
trate is not spilled in the vicinity of the filler
neck.
Checking coolant level
X
Park the vehicle on a level surface.
Only check the coolant level when the vehicle
is on a level surface and the engine has cooled
down.
X
Turn the SmartKey to position 2 in the igni-
tion lock (Y page 140).
On vehicles with KEYLESS-GO, press the
Start/Stop button twice (Y page 142).
X
Check the coolant temperature gauge in the
multifunction display.
The coolant temperature must be below
158 ‡ (70 †).
X
Turn the SmartKey to position in the ignition
lock u (Y page 140).
X
On vehicles with KEYLESS-GO, press the
Start/Stop button (Y page 142).
X
Press the Start/Stop button (Y page 142).
X
Slowly turn cap : half a turn counter-clock-
wise and allow excess pressure to escape.
X
Turn cap : further counter-clockwise and
remove it.
If the coolant is at the level of marker bar =
in the filler neck when cold, there is enough
coolant in coolant expansion tank ;.
If the coolant level is approximately 0.6 in
(1.5 cm) above marker bar = in the filler neck
when warm, there is enough coolant in expan-
sion tank ;.
X
If necessary, add coolant that has been tested
and approved by Mercedes-Benz.
X
Replace cap : and turn it clockwise as far as
it will go.
For further information on coolant, see
(Y page 387).
Adding washer fluid to the windshield
washer system
Example: washer fluid reservoir
X
To open: pull cap : upwards by the tab.
X
Add the premixed washer fluid.
X
To close: press cap : onto the filler neck
until it engages.
If the washer fluid level drops below the recom-
mended minimum of 1 liter, a message appears
in the multifunction display prompting you to
add washer fluid (Y page 273).
324
Engine compartment
Maintenance and care
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